Can your school take your invention from you?
If some sort of agreement was signed at all to build the invention, the most likely yes. If school materials were used to build the invention, yes. Applying for a patent is a way to protect the invention.
That depends on what classes you take. Generally, however, high school will be much harder. If you continue to take the classes you should take (i.e. you take classes in the high achiever program in middle school and then take honors and AP classes in high school), then yes, high school will easily be more challenging. If you take high achiever classes in middle school and then take general classes in high school, then middle…
Inventions of World War 1 The Invention of the Machine Gun The Invention of the Armored Tank The Invention of the Biplane The Invention of the Self Loading Rifle The Invention of the Flamethrower The Invention of Chemical Warfare The Invention of Tracer Bullets The Invention of the Hydrophone The Invention of the Aircraft Carrier The Invention of the UAV The Invention of Moist Towelettes (lol)